mid1_w04 - Avogadro's Number, NA = 6.022 1023 1. [7 points]...

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A = 6.022 × 10 23 1. [7 points] Carry out the following mathematical operation: 6.06 × 10 3 + 1.1 × 10 2 Which of the following answers is correct and has the correct number of significant figures? (a) 617 (b) 6.2 × 10 3 (c) 6.17 × 10 3 (d) 6.170 × 10 3 (e) 7.16 × 10 3 2. [7 points] From the list below identify those substances that are examples of molecular substances ? (a) Helium (b) Carbon in it&s Diamond Form (c) Nitrogen (d) Aluminum oxide (e) All of the above 3. [7 points] What is the empirical formula of sodium sulfite? (a) NaS (b) Na 2 S (c) NaSO 3 (d) Na 2 SO 3 (e) Na 2 SO 4 4. [7 points] What is the empirical formula of the ionic compound that forms between magnesium and sulfur? (a) Mg 2 S (b) MgS (c) MgS 2 (d) MnS 2 (e) MnS
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5. [7 points] If two atoms are isotopes, which of the following statements is false ? (a) They must have the same atomic number (b) They must have the same mass number (c) They must have the same number of protons (d) They must have different numbers of neutrons (e) They must be atoms of the same element 6. [7 points] Which of the following pairs of atoms/ions have the same number of electrons ? (a) 14 C and 14 N (b) 16 O 2- and 20 Ne (c) 63 Cu and 65 Cu (d) 39 K + and 39 Mg 2+ (e) both (b) and (c) 7. [7 points] In which of the following substances do the valence electrons have the most freedom to move from atom to atom to atom? (a) Metallic substances
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mid1_w04 - Avogadro's Number, NA = 6.022 1023 1. [7 points]...

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